Though winless in league play this year, Cathedral Catholic High senior Lizzy Bliz and her teammates have advanced to the San Diego Section water polo semifinals for the fourth time in her four varsity seasons.

And it will be Western League competition all over again for the fourth-seeded Dons. Since the creation of Division III in 2011, the league’s four teams have always comprised the postseason final four.

Bliz scored four goals to help propel Cathedral to a 10-3 quarterfinal victory over No. 5. University City at La Jolla High’s Coggan Pool on Saturday. With that, the Dons (15-14) qualified for a semifinal berth against three-time defending champion Bishop’s on Wednesday at the same site.

“It’s hard in league, but it prepares us for the playoffs,” Bliz said. “We know what we’re getting into. We’re just really excited to play some tough teams.”

First-year Dons coach Nicole Maichrowicz took the job with a hint of what was ahead in the league that also includes Coronado and La Jolla.

“I knew how competitive it would be, and I’m excited to see how the girls have progressed,” said Maichrowicz, whose squad went 0-6 in league but had a one-goal loss against each of its foes. “They’re competing well.”

Kelsey Blacker and Sam Torres each recorded two goals and two assists against University City (19-8) as the Dons pulled away after holding a 4-2 halftime edge.

As a playoff boost, junior offensive standout LJ Edwards returned to score a goal in her first game back since being sidelined by a rotator cuff injury in early January.

“It’s great timing,” Edwards said. “While I had to sit out, it was kind of good because I learned about my team, but I couldn’t wait to play again.”

When Cathedral faces Bishop’s, Maichrowicz coaches on the opposite side of her fiancé, Ian Davidson, the Knights’ assistant coach.

In Bishop’s 18-2 win over Mission Bay on Saturday, Natalie Chun had four goals to key a balanced attack for top-seeded Knights (23-6).